"Absolute pressure is based on the pressure of outer space being equal to zero."

0 Pa

Pressure is everywhere. The earth's atmosphere exerts pressure on us right
now. Although the pressure at an point of earth's surface is the equal. This is
true if you are at the same altitude on the earth as someone else. Pressure always
acts perpendicular to the surface.

Outer space is a very hostile place. Because of the very low pressure in outer
space humans have to be trapped in a spacesuit in fear of the boiling of their
bodily liquids. The fluids would not be able to evaporate entirely primarily because
of the rapid loss of heat energy. There is no place like home, where the average
pressure is 101,321 pascal (Pa). The formula P = F/A is used to find
pressure.

In outer space one would also face extreme changes in temperature. The temperature
in the sunlight is 120 °C, which is higher than the boiling point of
water. In the shade the temperature is about -100 °C, way below the freezing
point of water. The body tissue (skin, heart, other internal organs) would expand
because of the boiling fluids. However, they would not "explode"as
depicted in some science fiction movies, such as "Total Recall". Death
would occur within one minute.

The pressure in outer space is so low that many consider it as non-existant.
It has a pressure of 1.322 × 10−11 Pa. Pressure may be detected
from the molecule of air or water hitting you. Since there is very little air
and hardly ever water hitting you in space, pressure is almost zero or negligible.